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MLH and beeje hit the nail on the head. Tire pressure varies with the ambient air temperature. I filled my tires to 100 psi on a day it was 46 degrees. A few days later it was -1. I had set the TPMS minimum to 85 psi and it set off a warning. The tires were 83 to 85 psi. Once on the road the pressure climbed back up. Once I arrived in FL and the temps in the 60s the cold air pressure was in the 104 psi range.
Also check out the VIAIR 400P-RV Automatic Portable Compressor. A small kit that fits in the truck tool box and will quickly fill your tires to 100 + psi.
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John & Laura___& Bentley
2017 Montana 3950BR
2015 GMC Sierra Denali Dually
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